said by Thaler 
:said by hitachi369 :They subpoena the 3 magazines for there subscription base and find out whom locally has the same 3 magazine subscriptions and fits the given profile.
That's retarded. True, it's probably more likely they'd have those subscriptions, but there's still a chance out there that they might've picked them off the newstands.
Until you can identify a particular magazine (not distribution line, I mean the magazine print #), looking things up this way wouldn't be all that reliable.
This is what I mean, I don't think there is any easy way to track what magazine a letter came from. 
